But one actual reduction in complexity came with reform to the so-called “Kiddie Tax.” Under the old law (get ready for some real complexity) a dependent child under the age of 18, or under 19 who provides less than 50% of his/her support, or a full-time student under the age of 24 would divide his/her income into two buckets: earned and unearned (investment) income. If parents claimed the child as a dependent on their return, the child’s standard deduction would be the greater of $1,050 or the child’s earned income plus $350 up to the standard deduction amount of the parents. If the unearned income was more than $2,100, the investment income—but not the earned income—would be taxed at the tax rate of the highest-income parent. Got that?
Under the new 2017 tax act, each child’s tax is calculated using the trust tax rates rather than the parents’ tax rates. Unlike individuals, trust have just four brackets for ordinary income: 10% (up to $2,550), 24% ($2,551-$9,150), 35% ($9,151-$12,500) and 37%, with the top rate applied to all income over $12,500. For long-term capital gains, different rates apply
Of course, that means that children get to the highest tax rate with far less income than, for example, married individuals (where the top rate kicks in above $600,000 in taxable income) or heads of household ($500,000). But at least the calculation is simpler—certainly a rarity in our history of tax “simplification.”